Improved portable milk-cooler



'1. M, SANBORN, Portable Milk Coole r.

UNITED STATES PAT NT OFFICE.

JUBAL snnnoan, on HARDWIGK, ASSIGNOR TO HIMSELF, Anne. M,

GIEFORD, 0F WOLGO'IT, VERMONT.

IMPROVED PORTABLE MILK-COOLER.

Specificationforming part of Letters Patent No. 35,569, dated June 10, 1862.

To aZZ whontib may concern: I

Be it known that I, J UBAL M. SANBORN, of

. Hardwiclqin the county of Caledonia, in the State of Vermont,have invented a certain new and useful article which I term a Portable Cooler for Milk and other Liquids,but which 3 may also be used to :raise as wellas to lower thetemperature of the liquids; and I do hereby declare that the following is a full and exact description of the same, which has been prepared Witllfi view to the obtaining of Letters Patent therefor.

Dhe accompanying drawing forms a part of this specification,and represents averticalsection of a wooden bucket or tub with myinvention applied thereto in the manner which is obvious-to wit, byinserting it within the tub and thrusting its nose or discharging-tube tightly into and through a hole near the base of the sideof the tub. I I

The drawing represents my invention partly in elevation and partly in section, as will be readily distinguished on inspection.

My invention is a portable vessel or hollow case presenting alarge amount of surface within a smallcompass, and provided with a funnel and strainerfor receiving the liquid and a discharging-tube adapted to fit tightly to a hole in its containing-vessel, so as todischarge exterior thereto, the intermediate portion being adapted to the ready conduction of heatbetween the liquid within and that exterior to my invention, and the whole adapted to be readily drained-,rinsed,applied to its containing-vessel, used, and removed,in the man ner hereinafter set forth.

To enable. others to make and use my invention, I will proceed to describe its construction and operation by the aid of the drawing and l of the letters of reference denoted thereon.

A is a tapering tube, closed at its largest end and-bent at the point a, as represented. B B

B are tubes comul mlnicating therewith, opening at their lower ends into A and at their upper ends into a transverse pipe, (l,'which latter is of larger diameter and closed at each end.

Disaflaring funnel communicatingwith the I center of O, as represented, and open at the top to receive the milk or other fluid the te1nperature of which is to be changed.

, E is a strainer of wire-cloth or other suit able material, fitted within the funnel D, as represented,and adapted to insure the entrance into (lof only the properly-strained liquid.

The hole for the nose of A is bored in the tub in an inclined direction, as represented, and the taper of A allows it to befitted tightly therein without difficulty.

To use my invention it is fixed within the.

tub in the manner'represented and the tub filled or nearly filled with water, as indicated by the blue lines.

several tubes or chambers in my invention should be as cold as it is practicable to obtain. The milk or other liquid to be cooled is now poured at a moderate rate into the open funnel D, and allowed to flow out at the noseof A into a pail or other suitable vessel placed beneath to receive it.

' I make my several parts, A B C D, of thin brass, iron, or any suitable material. I pre- -fer for ordinary purposes common tinned iron,

certain to be attained if the process is so long continued as to cool a large quantity of milk-- it will ultimately lower the temperature of the milk too little unless the position of my invention be changed so as to bring the funnel D more nearly down to the same level as the discharging-nose. This I effect by changing inclination of the tub as the work proceeds, first inclining the tub in one direction, then allowing it to stand level, and finally inclining it in the direction opposite to that assumed at first. The varying of the position of my invention in this manner changes the rapidity with which the milk flows through the structure without materially varying the amount of effective cooling-surface, and therefore gives,

within certain limits, a complete control of the final temperature of the milk, whatever may If the milk is too warm, the water poured into the tub to surround the be the initial temperature of the milk and of the water, and this without a necessity for any stop-cock or other expensive contrivance.

Myinvcntion is applicable for any use where it is desired to cool one liquid to a moderate extent by means of another-as, for example, the cooling of milk just drawn from the cow, or the cooling of fresh water from a cask standing'in the sun, the first of which is of great importance in dairy operations in summer, and the latter a great addition to the comfort ofa sea voyage at the same season. I have realized an increase of about one-third in the quantity of the cream obtained from milk in hot weather by cooling it through the means herein shown.

J UBAL M. SANBORN.

Witnesses:

JOHN BRIDGMAN, ORREN B. HALL. 

